vp9-svc: Fix to the layer buffer settings.
For the case when the number of temporal layers > 1, the buffer levels (starting/optimal_buffer_level, and maximum_buffer_size) were not scaled properly. In vp9_update_layer_context_change_config(): when setting the layer-buffer levels, fix is to scale the layer-target_bandwidth by the target_bandwidth (which is the full stream bandwidth) instead of the spatial_layer_target. This is needed because prior to the call vp9_update_layer_context_change_config(), set_rc_buffer_sizes() is called which sets the buffer levels based on target bandwidth (which is the full bandwidth for the SVC stream). This fix properly sets the layer-buffer levels based on the layer-bandwidth, and leads to better rate targeting. Small/neutral change in avgPSNR/SSIM metrics on RTC set. Change-Id: Ic0f4f7f3487c37b9a9adb4781ae5edfed7140a57
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